Line-up and registering table for printers



Aug. 12, 1941. J. WEST ETAILYY LI NE-UP AND REGISTERING TABLE FOR PRINTERS Filed Nov. 9. 1959 7 Sheets-Sheet 1 |NVENTOR$I W BY ATTORN EY.

Aug. 12, 1941. J. WEST ETAL LINE-UP AND REGISTERING TABLE FOR PRINTERS Filed Nov. 9. 1959 7 Sheets-Sheet 2 IIII II III II IIIII IIIIIII IIIII IIIIII I I I II II I 1 I I I I I I I l I l I I I I I ATTORNEY.

Aug. 12, 1941. J. WEST ETAL LINE-UP AND REGISTERING TABLE FOR PRINTERS Filed Nov. 9, 1939 7 Sheets-Sheet 3 12g? I 5 2 I22 5o.' 52

ATTORNEY.

Aug. 12, 1941. J. WEST ETAL 2,252,535

LINE-UP AND REGISTERING TABLE FOR PRINTERS Filed Nov. 9, 1939 7 Sheets-Sheet 4 INVENTORS. fi w mw,

ATTORNEY. I

g- 1941. J. WEST ET AL 2,252,535

' LINE-UP AND REGISTERING TABLE FOR PRINTERS Filed Nov. 9, 1959 7 Sheets-Sheet 5 Aug. 12, 1941.

7 Sheets-Sheet 6 Filed NOV. 9, 1939 Til Q15 WW m mm 1 6 M T v m w h Illom N I I l fi m W o wlw H wm m H1 w .H m g l P 0 IF I E 8 s a 9 9 w y y ATTORNE 10.9 WORS:

7 Sheets-Sheet 7 J. WEST ET AL Filed Nov. 9, 1938 I LINE-UP AND REGISTERINQTABLE FOR PRINTERS Aug Patented Aug. 12, 1941 UNITED STATES 'RATE'NT OFFICE.

i 1 2,252,535 W Y i r LINE-UP AND REGISTERING ABLE FoR i B J James West, Newton, and :William- M. Davis,- Cambridge, Mass, assignors to Craftsman Line- Up Table Corporatibn waltliam, Mass, a cor-. poration of Massachusetts 7 Application November 9, 1939', Serial No. 303,550 r 1 claims. c1. a;.1s4.5

This invention relates to that class of apparatus used in the printing trade and commonly known as line-up tables. They are utilized primarily for the purpose of securing accurate line-up of the work and precisioniegister oi the copy, although useful for other purposes also.

The present invention aims to improve tables of this character with a view to increasing their range of usefulness and facilitating the performance of work connected with the-printing industry for which prior constructions'havemt been adapted. In particular, it aims to devise means whereby the workman can rule plates and negatives with speed and accuracy, 'can space the rule lines precisely, to make the operations pertion, illustrating a lighting apparatus which preferably is used with the transparent table top;

Fig; 18 a vertical, sectional view approximately on the line l8--|8, Fig. 17; and

Fig. 19. is a vertical, sectional view through the frame portion of the table top showing means provided by this'invention for use in squaring up the upper section which carries the glass plateu I I Referring first to Figs. 1 and 2, the construction there shown comprises a frame -2 and a formed on such a table easier for the operator to excute accurately, and to facilitatethe use of these tables in ruling riegatives," masking, stripping, opaquing, and other operations required in the various types of printing. It also aims to reduce the liability of accidentally'in Fig. 2 is a plan view with parts broken out;

Figs. 3'and 4 are sectional views approximate- 1y on the lines 3-3 and 4-4, respectivelyg Fig. 2; Figs. 5 and 6 are vertical and hofizontalsec tional views, respectively, of stops used on'the carriages;

Figs. 7 and 8 are sectional and plan respectively, *of a magnifying sight tube which forms an element of the apparatus Fig. 9 is a side elevation showing one end of the horizontal carriage in its elevated position;

of the mechanism for raising andlowering the glass top;

Fig. 11 is a rear elevation illustrating "the interlocking means between the carriages;

Fig. 12 is a rear elevation of a part ofthe horizontal carriage showing means for automatically raising the sight tube On the latter carriage to prevent interference with a stop on the vertical carriage;

the line l3-I3,Fig. 12;

Fig. 13a is a plan view of a stop provided with acam;

portion of the spacing mechanism; Figs. 15 and 16 are plan and end views, respectively, of the spacing mechanism; Fig. 17 is a side elevation, with parts in see- Fig. 14 is a vertical, sectional viewthrough' a i I carriage comprises a shaft l0 supportedbygears Fig. 10 is a sectional View through 'a portion wheel I 6.

tabletop 3, the latter being hinged at its for ward edge to the frame "so that its rearward edge can be lifted and supported in any convenient manner with the entire top in an inclined position. 7 The table top includes a rectangular'metal frame with a central glassfplate 4 and Sui-mama ing marginal strips 5. Along the front of the opening in which the plate 4 is located, a metal scale fi'is'provi'ded, as best shown in Fig. 1. "so far as this part ofthe apparatus is concerned, the construction is similar to tables incommon use. Mounted'for movement across this table top in directions at right angles to each other, are

. two carriages indicated, in general, at 8 and 9,

respectively, the former usually being referred to as the horizontal carriage? and the-latter as the vertical carriagef-because they are used inmaking horizontal or vertical lin'esfrespeci .4.; tively; orin checking alignment in these direc- VIGW'S',

tio'ns. The latter cooperates with the scale 6 and the former with a similar scale 28 mounted on the carriage 9. j

As shown in Figs. 1, 2 and 3, the horizontal lI-l I fixed thereon near opposite ends thereof, these gears running on toothed racks or tracks 12-12 secured to the frame pieces; 13 of the table top. The gears are enclosed in housings M-IA,

one of them being provided with an integral extension I4',' and a truss bar I5, square in vertical section, is secured at one end to said extension and at its opposite end to the gear housing at the right hand end of the table. A metal straight edge 5', Fig. 2, is secured to the bottom Fig. 13 is a sectional view approximately'on of the bar l5 and is graduated along itsmargin, the bar lying normally just above the surface of the glass top 4. At the left-hand end of the carriage the shaft I0 is equipped with a hand Consequently; byturning this wheel the carriage may be moved backward or forward on its racks, or it can merely be pushed by hand. Preferably the portion of the shaft Ill between the gear casings is enclosed loosely in'a sleeve spring latch 3 I.

l8, and a hand piece I! is secured to it. The carriage may be locked in any position of adjustment by turning down a thumb screw 20 so that its lower end will bear against the shaft Ill.

The vertical carriage 9 is similar in construction to the"horizo'ntal carriage and includes a shaft 2|, Fig. 4, supported on'gears 2222 enclosed in housings 2323 and running on toothed racks 24-24. A hand wheel 25 is secured to the right-hand end-Fig. 1,-of the shaft and, if desired, the portion of the latter between the gear casings may be enclosed loosely in a sleeve 26, as shown in Fig.-4.' jThis carriage also is equipped with a truss bar 2]"and a straight edge 28 secured thereto, all of these parts being constructed and arranged in essentially the same manner as the horizontal carriage. Similarly, it includes a set screw 30, Figs. 1 and 2, by means of which the carriage may be locked in any desired position. .1 v a Theseestraightg edges'.-and their cooperating trussy bars are utilized iniperforming'the aligning, marking, regi stering, and= similar functions. For this purpose-theymust both .be movable'in a plane closelyadjacent to, the surface of. the glass top 4, :and both obviously cannot occupy this position at the same time. Onefeature of this invention, therefore, resides in an arrangement whereby one carriage can be 'moved into a plane entirely out of the path .of travel 'of the other whenever it is desired to use the latter. As shown, the tracks or racks |,2l 2 for the horizontal, carriage 8 are provided near theirrearward ends with inclined portions aa,.Fig. 1, followed by short horizontal lengths b -119150 that this carriage canbe'pushed rearwardly on to the elevated parts 11-1) of its track where it will be entirely above the planeof-operation of the vertical carriagefl. The latterfcan then be used without danger of interference with the'former.

Normally the vertical carriage. 9 is locked in its extreme left-hand position, as shown in Figs. 1 and2, by means of 'a spring latch 3|, Figs. 1 and-2, which snaps over a stop 32 fast on the frame. In this position the arm l4 of the horizontal carriage clears the vertical carriage parts which overlie the working area of the table, as clearly shown in Fig. 3. 7

. .It is also'important to lockthehorizontal carriage. in its elevated and inoperativeposition. For thispurposega-headedstud 33, Figs. 2 and9, is rigidly secured in the left-hand gear casing M for the horizontal carriage and projects reara small lever pivoted on the carriage. The normal position of the carriage is determined by a roller 31, Figs. 9 and 11, running on the table top just inside the racks. Any danger of lifting either gear II out of mesh with its track is prevented by'a pin 33, Fig. 9, both the pin and the roll 36 underlying a flange or rail 43, Fig. 3, which projects laterally beyond the rack. At the raised sections of the tracks a supplemental flange 4|, Fig. 9, is provided, this flange being cut away, as shown at 42, to permit the passage of the pin 38. Similar pins and rolls are proments on the vertical carriage.

wardly therefrom where it maybe engaged by I a spring pressed latch 34, Fig. 11,,which is pivoted on the machine'frame at 35. So long as the vertical carriage is in its inactive position, .as shown in Figs.- 1 and .2, it bears against the lower ever, as the vertical carriage is moved away from its idle position, even by a very small amount, it releases the latch, and the latter then engages the stud 33 and locks the horizontal carriage in its inoperative position. The horizontal carriage remainslocked until released by the movement of the vertical carriageback-into its idle position again where it is automatically locked by the Thus this interlocking arrangement prevents interference of one carriage with the other. 1 Either carriage-can be tipped about the axis of its own shaft to raise its straight edge and suchtipping movement of the horizontalv carriage is limited by a roll 36, Fig. 9, mounted on lendof the latch and holds it in its dotted line position, as shown in Fig.-11.-' As soon, how- The scales 6 and 28 are graduated very accurately and in such closely spaced divisions that it is tiresome and sometimes difficult to use them. In order to avoid this difiiculty and to facilitate the precise positioning of the carriages. each is equipped with a magnifying sighting tube. A. typical form is shown at 44 in Figs. '7, 8 and 12. On the vertical carriage such a tube is simply mounted on a bracket 45, Fig. 2. On the horizontal carriage, however, the tube is supported on an arm 46' pivoted on the stud 4-7, Figs. 12 and ,13. In either event, the sighting tube is so positioned as to overlie the scale with which its respective carriage cooperates during its entire path of travel. Also, each tube is equipped with a mark or cross-hair adapted to be registered with the graduations on the scale, Such an arrangement facilitates accurate adjustment of "the carriages and reduces the fatigue and eye strain required in making adjustments.

In using this machine a ruling pen, scoring implement, or marking device of some kind is mounted on one or the other of the bars i5 or 21; Such a device is shown in Fig. 1 at 48 fitting slidably on the bar. Often it is necessary to move this devicerepeatedly through a given range of travel in order to make a series of parallel lines of predetermined lengths. For this purpose stops, such asthose shown at 59 in Figs. 2, 5 and 6, are adjustably mounted on the bars. There is some tendency for. the repeated striking of these stops by the marking device to move the former out of their adjusted positions. According to thi invention, therefore, each of the bars [5 and 21 is provided with tapered grooves,

such as those shown at 5! in Figs. 5 and 6; and a gib 52 of corresponding cross-sectional shape is carried by each stop and held in the groove by a set screw 53. By tightening up this screw the step may be locked very securely to the bar.

- .As will be observed from an inspection of Figs. 2 and 3, the extension M of the left-hand gear casing I4 overlies the vertical bar while the horizontal carriage is in its operative position. As it is moved backward and forward, there is danger of the arm 46 which supports the sighting tube 44striking one of the stops 5!] on the vertical carriage. Each of these stops, therefore, preferably is provided with a cam piece 5!, Fig. 13, and a pin 52 is secured tothe lower side of the arm 46 so that, in the event of engagement with the cam, these two parts 5! and 52 will cooperate to swing the arm 45 into an elevated position where it will ride over the stop.

A limited vertical adjustment of the glass plate 4 is desirable to accommodate work of varying thicknesses. According to this inven- .tion, this plate is mounted on blocks 53, Fig. 10,

of fiber, or other suitable material, supported in an angle iron frame 54. At its four corners the frame is supported by vertical screw-threaded studs, one of which is shown in 10 alt- 55,

the points of the screws --fitting -iinto tapered sockets in the upper ends respectively, "of four shafts 56, each having a section screw threaded through a portion of the stationary-frame of th'e machine. Below the screw-threadedportion a sprocket wheel '51 is "secured to each of these shafts. Also, as shown in Fl'g. 2, a sprocket chain 58 engages all of the sprocket wheels and is attached to a slide 60 providedwith a handle H which projects atone side of the frame into a convenient position to 'be' grasped by the operaspaced parallel lines as, for example, ruling negatives. This is a very exacting and laborious operation requiring much skill, patience, and

extremely'good eyesight. It isone of the objects of this invention, therefore, to reduce the time,

labor, and skill involved in performing -'-operations of this kind. To this "end the invention proposes to equip one or both of the-carriages with a mechanism designed 'to be operated by a" lever, or equivalent devicewhich will automatically adjust the carriage by a distance predetermined 'bythe operator-so that it is merely necessary for him to set "the apparatus to the spacing desired and then operate the lever, the adjusting or spacing movement being produced automatically. A further feature of 'this invehtion is 'th'a tfthe mechanism is made of a-doubleor duplex character so that spacings in predetermined' fractions of an inch, or in some measure better'suited' to the printing trade, such as pica's, can be made, as

desired, and a shift from one to the other can be accomplished quickly and conveniently-.-

Considering first thev'ertical carriage 9, the gear housing 23 at the r-ight ha'nd "end, Fig. L'of the carriage 9 i's replaced by such a housing as that shown at 63 in Figs. 14 to '16, "this housing being adapted to receive the shaft 2"] and its cooperating gear 22. Meshing with the gear 22 is a split driving pinion "c'omprisin'gtWo sections 64 and 65, the former being secured to a shaft '66 and the latter to a hollow-shafts! in which the first shaft fits. At the right-hand end, Fig.

14, the two shafts are connected by a coiled spring 68, better shown in =Fig516,thisconnection being madeto a small knurled wheeler knob '18 secured to the outer shaft by a set screw H. The spring 66 exerts a torsional action tending to revolve oneshaft relatively to the other and thus, in effect, spreads the teeth-oi the pinion which drives the *gear 22 at any instant and thus prevents any back lash in this driving connection. The composite shaft so provided is supported in ball bearings 12 and 13.

Two ratchet wheels? and 15,1'espectively, Fig. 14, "are mounted fast "on clutch *hubs "It and 11, respectively, thefformer rotating freely on the shaft 61 and the latter on women 'me'm'b'en" v keyed to said shaft. Another *clutc'h element 80, similar to the part "T8,"is likewise keyed to the hollow shaft '61. Between these members is a disk 81 mounted on a ball bearing "82 on a hub portion of the part 16, suitable clearance being provided between 'theparts T6 and "11 to {enable the disk '8l to be revolved freely "at an times.

The tapered surfaces between the'parts 16 and 88:?and between thesimila'r parts Ti and I8 adapt them to function as friction .colutches and they may be locked in a iclutching relationship fby tu'rning the collar83 which is screw-threaded "onfithe shank of the part 18. When so locked the zpinion"6465 is secured rigidly to both ratchet wheels 14 and 15. The latter are provided with teeth of different spacings in order 'to' produce different angular movement of the pinion =f0rthe same angular movement of the disk '8ll, and alever 84 provided with a handle is secured to said. disk in order to operate it.

Pivoted-on this lever are two pawls 85 and 86 and each has an hexagonal portion rigid therewith, that on the pawl 85 being shown at 81, Fig. --16. A T-shaped spring 88 secured to said lever has its free end-s curved to bear, respectively, against the flattened faces of the part 81 for the pawl 85 and also against a corresponding partfor the other pawl, so that the spring tends to hold' both pawls in engagement with their respective ratchet wheels. However, if either pawl is lifted manually, the spring will snap over on to another fiat face and will then hold that pawl inan inoperative position. Thus either pawl and ratchet unit of the spacing mechanism may beused, as desired. The amplitude of swing of the operating lever 84 is limited by a stop screw 90 threaded through a stationary bracket 9|, Fig. 16, andby another stop screw 92 secured to a bracket 93 adjustable in a dovetail guideway formed in the sector 94. Its position along said 'guideway may be changed as desired. and it may be locked in its adjusted position by a clamping screw 95. Also, the bracket 93 carries a gauge plate 96', Fig. 15, overlying a graduated plate 91 which is secured to the outer curved surface of the sector 94. The plate 91, as shown, carries twoscales, one graduated in, say, sixty-fourths of an inch and the other in picas, or seventy-seconds of an inch. Often, however, the latter graduation is replaced by one in thousands of an inch, in which case the ratchet wheel T4 is replaced by one witha different tooth spacing.

In using this mechanism if the pawl 86 is thrown out of operation, the workman can ad- ..just the slide 93 so that for each stroke of the lever 84 he will move the vertical carriage 9 a certain fraction of an inch. That fraction may be made anything that he wishes within the range of the apparatus. Usually these adjustments are made anywhere from a sixty-fourth of an inch to half an inch. He can repeat a given spacing as frequently as he wishes and change whenever he desires. If 'hewishes to change to the .pi'cascale, he can do that at any time by "throwing out the .pawl 85 and swinging the other pawl 86 into its operative position. The clutch arrangement enables him to position his straight .edgeaucurately for the start of the ruling operation and then, by releasing the clutch, to bring 'a to'oth of the selected ratchet wheel into engagement with the pawl so that when the clutch has been tightened up and he makes his first movement of the lever 84, an! accurate spacingw-ill be produced. The locking screw 38 for 'the c'arriageis inserted in the hole 30', Fig. 15.

{Withthe aid or such a spacing mechanism, the labor involved in-ruling for-ms and plates is great- 1y reduced and it can be performed easily with a degree =o'f accuracy that is very difficult indeed fora workman to duplicate-by hand. Also, by 'releasingthe clutch the carriagecan be manually adjusted backward and forward by turning the knob 10 exactly as in the constructions shown in .Figs. 1 and 2.

in transverse section. It extends lengthwise of the table, or from right to left, Fig. 1. The upper margins of the reflector plates may be secured to, the angular frame 54 in which the glass top A is mounted, while their lower edges are secured to the margins of a central supporting channel 99 extending the entire length of the reflector. In addition to the side plates 98--98 the reflector also includes end plates H10I00. A suitable source of illumination is mounted on the channel 99 consisting, for example, of incandescent electric lamps, or a lamp of the tubular type. In either event the source of light is elongated and is placed in the focal axis of the reflector 98 so that the rays of light issuing therefrom will be reflected upwardly in parallel relation to each other. In order to soften the glaring rays of light transmitted directly upward from the lamps, a translucent plate of opal or frosted glass 182 is positioned horizontally in the reflector structure directly over the line of lamps and is made of sufficient width to intercept all the glaring rays that otherwise would pass through the glass plate 4. It is, however, made sufliciently narrowso as to offer a minimum of interference with the reflected rays. Thisplate .may conveniently be supported in small brackets 33 secured to the end plates of the reflector. Also, one or more pedestals or rests, such as that shown in Fig. 17 at I04, may be used to support the plate Hi2 at intermediate points in itslength. One of the side walls of the reflector also is provided with a door I05 hinged at H36 and releasably locked in its closed position, as by screws Ill'l. This door affords convenient ac'cess'to the interior of the reflector for the purp'os'e'of installing lamps, replacing them, or makingother repairs.

The frame 5 for the table top preferably consists of two superposed sections a: and y, Figs. 1,

10 and 19, of angular section, the side andend 1 pieces of each frame being welded, riveted, or otherwise secured rigidly together, at their corners. Reinforcing corner brackets, one of which is shown in Fig. 10 at I08, are also secured in the four corners of the upper frame 'zc tostiifen it. The racks on which the carriages run are secured to the horizontal flange of the upper section at. There is a tendency for these sections to warp, or in some cases to get out of proper angular relationship to each other during shipment or because of conditions peculiar to the location in which they are used. Faults of level may readily be corrected, but if the two lateral side members of the top frame are not exactly at right angles to the front and back members, then that fact will introduce errors in the work. This invention, therefore, provides a means operable to correct such errors of angular relationship.

Referring to Fig. 1 and also to Fig. 19 which shows a vertical section slightly in front of the .rearward frame, members, it will be seen that small brackets Ml-I09 are secured rigidly to opposite. ends of the lower frame section 11/. Each :of them has an upwardly extending arm through which a, set screw H0 is threaded and bears against the upper section. Consequently, if the upper frame section at is found to be out of square in a horizontal plane, it may be trued up by backing off the appropriate one of the two set screws. just mentioned and tightening up the other. These two frame sections are connected together by two small plates l|2ll2 at the front of the table, as shown in Fig. 1, and atthe back of the table by a similar plate H3, Fig. 19. The screws 1 14, by means of which this plate is secured-to the upper frame member a, pass through slots in the plate, H3. Before making .th adjustment just described these screws should be loosened so as toallow the upper section to have more freedomof movement relatively to the lower-section than otherwise would be permitted, and the screws should be tightened up after the adjustment has been completed. The lower frame y also is stiffened .at the corners by gusset plates (not shown) but the two frames are not connected together except by the small plates I 12 and H3 above referred to. This arrangement affords a very satisfactory means for correcting the angular errors above referred to.

The table provided by thisinvention represents an important advance over prior art constructions in accommodating a much wider range of work thanthese earlier constructions, and

facilitating the operations performed on a table of this character to such a degree that the work is made easier and the amount of work which an operator can turn out ina given length of time is materially increased.

Having thus described'our invention, what we desire'to claim as new is:

1. A, line-up .table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, and racks supporting said carriages for' said movement, the racks for one of said carriages including sections supporting the vcarriagefor movement into a level out of the plane of operation of the other carriage.

.2. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said. carriages, racks supporting said carriages for said movement, the racks for one of said carriages including portions supporting its respective v carriage for movement into a position out of the path of operation of the other carriage, and means under the control of one of .said carriages for locking the other in its in- :operative position out of the way of the first carriage. r

3. A line-up table structure comprising the combination of a table top, two carriages mounted for movement acrosssaid top at right anglesto each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, the racks for one of said carriages including portions supporting its respective carriage for movement into a position out of the path of operation of the other carriage, and automatic means for locking both of said carriages in their inoperative positions where each will be out of the way of the other.

4. Aline-up table according to preceding claim 1, in; which one of said carriages, has a part bridging the other when the latter is in its P1 erative position, i v v a a 5. A line-up table structure comprising the combination oi a table top, two carriages mounted for movement across said top, atright angles to each other, straight edges mounted; on said carriages, racks supporting said carriages for said movemenaone of saidcarriages haying gears meshing with its respective racks, a1 1d a spacing mechanism operable through one of said gears to give the carriage predetermined adjust-1 ing movements across said table, said mechanism being adjustable to change the extent of said movements. a j

6. A line-up table structure comprising the combination of :a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, one of said carriages having gears meshing with its respective racks, and a pawl and ratchet spacing mechanism operable through one of said gears to give the carriage predetermined adjusting movements across said table.

7. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, and a duplex spacing mechanism operable through one of said gears to give the carriage predetermined adjusting movements across said table, said spacing mechanism including a common operating element for both spacing units, and means operable to throw either unit of said mechanism into action selectively, as desired.

8. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top atmight angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, a duplex pawl and raltchet spacing mechanism operable through one of said gears to give the carriage predetermined adjusting movements across said table, said mechanism including a lever for operating both units of the spacing mechanism, means adjustable to limit the range of movement of the lever, and

means operable to throw either unit into action to the exclusion of the other, as desired.

9. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, one of said carriages having gears meshing with its respective racks, a pawl and ratchet spacing mechanism operable through one of said gears to give the carriage predetermined adjusting movements across said table, means operable through said gear for manually adjusting said carriage independently of said spacing mechanism, and additional means operable to throw said spacing mechanism into and out of action at will.

10. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, one of said carriages having gears meshing with its respective racks, a pawl and mechanism operable through one of said gears to I give the carriagepredetermined adjusting movements across said table, said mechanism ineluding a manuallyoperable lever for actuating the mechanism a gra'duatedv scale cooperating with said lever to indicate its range of movement, and means adjustable to control said range of movement.

12. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, a duplex spacing mechanism operable through one of said gears to give the carriage predetermined adjusting movements across said table, said spacing mechanism including a common operating lever for both spacing units, means operable to throw either unit of said mechanism into action selectively, as desired, separate scales cooperating with said lever to designate adjustments produced by the respective units, and means adjustable to limit the range of movement of said lever.

13. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mountedron said carriages, racks supporting said carriages for said movement, one of said carriages including a truss bar, a straight edge associated therewith, said bar having a longitudinal groove in one edge thereof, a stop mounted on said bar and having a gib located in said groove, and means acting on said gib to lock the stop in its various adjusted positions on said bar.

14. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said car-' riages, said top including a frame, and means operable to adjust said frame angularly in substantially the plane of said top to. correct errors of angular relationship of the side and. end members of said frame to each other.

15. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, said top including a frame, racks supporting said carriages for said movement, and means operable to adjust the racks supporting one of said carriages to bring them into right angle relationship to the other racks.

16. A line-up table structure comprising the combination of a table top, two carriages mounted for movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, the top of said table including a frame comprising two sections mounted one above the other and both'connected together at one end of the table, and means at the other end operable to' adjust the latter end of one section in substantially its own plane relatively to the other section and without disturbing the vertical relationship of the two sections.

' 1'7. A line-up table structure comprising the combination of a table top, two carriages mounted for'movement across said top at right angles to each other, straight edges mounted on said carriages, racks supporting said carriages for said movement, the-racks for one of said carriages including portions supporting its respective carriage' for movement into a position out of the path of operation of the other carriage, and automatic interlocking means for said carriages cooperating with them to prevent interference of one with the movements of the other.

I 18'. A line-up table structure comprising the combination with a transparent table top, a straight edge, and means supporting said straight edge 'on said structure for movement across said top, of illuminating means for said top including a trough-like reflector of approximately parabolic form in transverse section positioned immediately below said top, an elongated source of light located substantially in the longitudinal focal axis of said reflector, and a translucent plate positioned longitudinally in said reflector immediately above said source of light and of such width as to intercept and soften the direct rays of light which originate at said source and travel through said transparent table top.

JAMES WEST. WM. M. DAVIS. 

